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FEDERAL HOME LOAN BANK OF BOSTON ADVANCES - Short-term FHLBB advances (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Banking and Thrift [Abstract]
Highest month-end balance during period
Ending balance
Average balance during period		$ 2
Weighted average rate during period	0.00%	0.02%
Weighted average rate at end of period

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References+ Details

- Definition

Describes the weighted average interest rate applicable to the specific advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

+ References+ Details